Add derive feature to serde #81

Job	Run time
Rust lints (libp2p)	2m 44s
Rust lints (waku)	5m 15s
Check (libp2p)	2m 45s
Check (waku)	4m 16s
Test Suite (libp2p, ubuntu-latest)	13m 44s
Test Suite (libp2p, windows-latest)	31m 52s
Test Suite (libp2p, macos-latest)	14m 22s
Test Suite (waku, ubuntu-latest)	13m 49s
Test Suite (waku, windows-latest)	35m 24s
Test Suite (waku, macos-latest)	21m 34s
	2h 25m 45s

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